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/*
* Copyright 2021 Lightbend Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package kalix.scalasdk.replicatedentity
import kalix.javasdk.impl.replicatedentity.ReplicatedMapImpl
import kalix.protocol.replicated_entity.ReplicatedEntityDelta
import kalix.replicatedentity.ReplicatedData
import kalix.scalasdk.impl.replicatedentity.ScalaReplicatedDataConverter
import kalix.scalasdk.impl.replicatedentity.ScalaReplicatedDataFactoryAdapter
/**
* A Replicated Map that allows both the addition and removal of [[ReplicatedData]] objects.
*
* Use the more specialized maps if possible, such as [[ReplicatedCounterMap]], [[ReplicatedRegisterMap]], and
* [[ReplicatedMultiMap]].
*
* A removal can only be done if all of the additions that caused the key to be in the map have been seen by this node.
* This means that, for example, if node 1 adds key A, and node 2 also adds key A, then node 1's addition is replicated
* to node 3, and node 3 deletes it before node 2's addition is replicated, then the item will still be in the map
* because node 2's addition had not yet been observed by node 3. However, if both additions had been replicated to node
* 3, then the key will be removed.
*
* The values of the map are themselves [[ReplicatedData]] types, and hence allow concurrent updates that will
* eventually converge. New [[ReplicatedData]] objects may only be created when using the
* [[ReplicatedMap#getOrElse(Any, Function)]] method, using the provided [[ReplicatedDataFactory]] for the create
* function.
*
* While removing entries from the map is supported, if the entries are added back again, it is possible that the value
* of the deleted entry may be merged into the value of the current entry, depending on whether the removal has been
* replicated to all nodes before the addition is performed.
*
* The map may contain different data types as values, however, for a given key, the type must never change. If two
* different types for the same key are inserted on different nodes, the replicated entity will enter an invalid state
* that can never be merged, and behavior of the replicated entity is undefined.
*
* Care needs to be taken to ensure that the serialized value of keys in the set is stable. For example, if using
* protobufs, the serialized value of any maps contained in the protobuf is not stable, and can yield a different set of
* bytes for the same logically equal element. Hence maps should be avoided. Additionally, some changes in protobuf
* schemas which are backwards compatible from a protobuf perspective, such as changing from sint32 to int32, do result
* in different serialized bytes, and so must be avoided.
*
* @tparam K
* The type of keys.
* @tparam V
* The replicated data type to be used for values.
*/
class ReplicatedMap[K, V <: ReplicatedData] private[scalasdk] (override val delegate: ReplicatedMapImpl[K, V])
extends InternalReplicatedData {
/**
* Get the [[ReplicatedData]] value for the given key.
*
* @param key
* the key of the mapping
* @return
* the [[ReplicatedData]] for the key
* @throws NoSuchElementException
* if the key is not preset in the map
*/
def apply(key: K): V = delegate(key)
/**
* Optionally returns the [[ReplicatedData]] value for the given key.
*
* @param key
* the key of the mapping
* @return
* an option value containing the value associated with `key` in this [[ReplicatedMap]], or `None` if none exists.
*/
def get(key: K): Option[V] = delegate.getOption(key)
/**
* Get the [[ReplicatedData]] value for the given key. If the key is not present in the map, then a new value is
* created with a creation function.
*
* @param key
* the key of the mapping
* @param create
* function used to create an empty value using the given [[ReplicatedDataFactory]] if the key is not present in the
* map
* @return
* the [[ReplicatedData]] for the key
*/
def getOrElse[ValueT <: ReplicatedData](key: K, create: ReplicatedDataFactory => ValueT): ValueT = {
ScalaReplicatedDataConverter
.convert(
delegate
.getOrElse(key, factory => create(ScalaReplicatedDataFactoryAdapter(factory)).asInstanceOf[V]))
.asInstanceOf[ValueT]
}
/**
* Update the [[ReplicatedData]] value associated with the given key.
*
* @param key
* the key of the mapping
* @param value
* the updated [[ReplicatedData]] value
* @return
* a new map with the updated value
*/
def update(key: K, value: V): ReplicatedMap[K, V] =
new ReplicatedMap(delegate.update(key, value))
/**
* Remove the mapping for a key if it is present.
*
* @param key
* key whose mapping is to be removed from the map
* @return
* a new map with the removed mapping
*/
def remove(key: K): ReplicatedMap[K, V] =
new ReplicatedMap(delegate.remove(key))
/**
* Remove all entries from this map.
*
* @return
* a new empty map
*/
def clear(): ReplicatedMap[K, V] =
new ReplicatedMap(delegate.clear())
/**
* Get the number of key-value mappings in this map.
*
* @return
* the number of key-value mappings in this map
*/
def size: Int = delegate.size
/**
* Check whether this map is empty.
*
* @return
* `true` if this map contains no key-value mappings
*/
def isEmpty: Boolean = delegate.isEmpty
/**
* Check whether this map contains a mapping for the given key.
*
* @param key
* key whose presence in this map is to be tested
* @return
* `true` if this map contains a mapping for the given key
*/
def contains(key: K): Boolean = delegate.containsKey(key)
/**
* Get a [[Set]] view of the keys contained in this map.
*
* @return
* the keys contained in this map
*/
def keySet: Set[K] =
delegate.keys
/**
* Get a [[ReplicatedCounter]] from a heterogeneous Replicated Map (a map with different types of Replicated Data
* values).
*
* @param key
* the key for a Replicated Counter in this map
* @return
* the [[ReplicatedCounter]] associated with the given key, or an empty counter
*/
def getReplicatedCounter(key: K): ReplicatedCounter =
getOrElse(key, factory => factory.newCounter)
/**
* Get a [[ReplicatedRegister]] from a heterogeneous Replicated Map (a map with different types of Replicated Data
* values).
*
* @param key
* the key for a Replicated Register in this map
* @return
* the [[ReplicatedRegister]] associated with the given key, or an empty register
* @tparam ValueT
* the value type for the Replicated Register
*/
def getReplicatedRegister[ValueT <: AnyRef](key: K): ReplicatedRegister[ValueT] =
getReplicatedRegister(key, () => null.asInstanceOf[ValueT])
/**
* Get a [[ReplicatedRegister]] from a heterogeneous Replicated Map (a map with different types of Replicated Data
* values).
*
* @param key
* the key for a Replicated Register in this map
* @param defaultValue
* the supplier for a default value when the register is not present
* @return
* the [[ReplicatedRegister]] associated with the given key, or a default register
* @tparam ValueT
* the value type for the Replicated Register
*/
def getReplicatedRegister[ValueT](key: K, defaultValue: () => ValueT): ReplicatedRegister[ValueT] =
getOrElse(key, factory => factory.newRegister(defaultValue()))
/**
* Get a [[ReplicatedSet]] from a heterogeneous Replicated Map (a map with different types of Replicated Data values).
*
* @param key
* the key for a Replicated Set in this map
* @return
* the [[ReplicatedSet]] associated with the given key, or an empty set
* @tparam ElementT
* the element type for the Replicated Set
*/
def getReplicatedSet[ElementT](key: K): ReplicatedSet[ElementT] =
getOrElse(key, factory => factory.newReplicatedSet)
/**
* Get a [[ReplicatedCounterMap]] from a heterogeneous Replicated Map (a map with different types of Replicated Data
* values).
*
* @param key
* the key for a Replicated Counter Map in this map
* @return
* the [[ReplicatedCounterMap]] associated with the given key, or an empty map
* @tparam KeyT
* the key type for the Replicated Counter Map
*/
def getReplicatedCounterMap[KeyT](key: K): ReplicatedCounterMap[KeyT] =
getOrElse(key, factory => factory.newReplicatedCounterMap)
/**
* Get a [[ReplicatedRegisterMap]] from a heterogeneous Replicated Map (a map with different types of Replicated Data
* values).
*
* @param key
* the key for a Replicated Register Map in this map
* @return
* the [[ReplicatedRegisterMap]] associated with the given key, or an empty map
* @tparam KeyT
* the key type for the Replicated Register Map
* @tparam ValueT
* the value type for the Replicated Register Map
*/
def getReplicatedRegisterMap[KeyT, ValueT](key: K): ReplicatedRegisterMap[KeyT, ValueT] =
getOrElse(key, factory => factory.newReplicatedRegisterMap)
/**
* Get a [[ReplicatedMultiMap]] from a heterogeneous Replicated Map (a map with different types of Replicated Data
* values).
*
* @param key
* the key for a Replicated Multi-Map in this map
* @return
* the [[ReplicatedMultiMap]] associated with the given key, or an empty multi-map
* @tparam KeyT
* the key type for the Replicated Multi-Map
* @tparam ValueT
* the value type for the Replicated Multi-Map
*/
def getReplicatedMultiMap[KeyT, ValueT](key: K): ReplicatedMultiMap[KeyT, ValueT] =
getOrElse(key, factory => factory.newReplicatedMultiMap)
/**
* Get a [[ReplicatedMap]] from a heterogeneous Replicated Map (a map with different types of Replicated Data values).
*
* @param key
* the key for a Replicated Map in this map
* @return
* the [[ReplicatedMap]] associated with the given key, or an empty map
* @tparam KeyT
* the key type for the Replicated Map
* @tparam ValueT
* the value type for the Replicated Map
*/
def getReplicatedMap[KeyT, ValueT <: ReplicatedData](key: K): ReplicatedMap[KeyT, ValueT] =
getOrElse(key, factory => factory.newReplicatedMap)
final override type Self = ReplicatedMap[K, V]
final override def resetDelta(): ReplicatedMap[K, V] =
new ReplicatedMap(delegate.resetDelta())
final override def applyDelta: PartialFunction[ReplicatedEntityDelta.Delta, ReplicatedMap[K, V]] =
delegate.applyDelta.andThen(new ReplicatedMap(_))
}
